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Posted 5 Sep 2002

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Logical XOR operator

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3.10/5 (13 votes)
5 Sep 2002
A simple implementation of a logical xor operator.

Introduction

Occasionally I come to a need of a logical xor operator (^^) that, obviously, doesn't exist in C++. However, it can be rather easily implemented.

Code listing

#define log_xor || log_xor_helper() ||


struct log_xor_helper {
    bool value;
};

template<typename LEFT>
log_xor_helper &operator ||(const LEFT &left, log_xor_helper &xor) {
    xor.value = (bool)left;
    return xor;
}

template<typename RIGHT>
bool operator ||(const log_xor_helper &xor, const RIGHT &right) {
    return xor.value ^ (bool)right;
}

Examples

0 log_xor 0 == false
0 log_xor 5 == true
8 log_xor 0 == true
8 log_xor 5 == false

Other details

  • Although they don't have to have the same type, operands should be castable into a simple boolean.
  • Precedence of log_xor operator is the same as logical or's (||) one.
  • If you decide to use it, I suggest you to add log_xor keyword to the usertype.dat file and insert somewhere the #pragma warning(disable: 4800) line.

License

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Croatia Croatia
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Comments and Discussions

 
AnswerRe: What is this all about? Pin
Goran Mitrovic7-Sep-02 4:01
Goran Mitrovic7-Sep-02 4:01 
GeneralRe: What is this all about? Pin
Roman Nurik7-Sep-02 7:04
Roman Nurik7-Sep-02 7:04 
GeneralRe: What is this all about? Pin
Goran Mitrovic7-Sep-02 7:24
Goran Mitrovic7-Sep-02 7:24 
GeneralRe: What is this all about? Pin
Goran Mitrovic7-Sep-02 7:39
Goran Mitrovic7-Sep-02 7:39 
GeneralRe: What is this all about? Pin
Tim Smith9-Sep-02 9:53
Tim Smith9-Sep-02 9:53 
GeneralRe: What is this all about? Pin
Goran Mitrovic9-Sep-02 11:42
Goran Mitrovic9-Sep-02 11:42 
GeneralCool Beans Pin
Anonymous6-Sep-02 10:46
Anonymous6-Sep-02 10:46 
GeneralRe: Cool Beans Pin
Goran Mitrovic6-Sep-02 15:35
Goran Mitrovic6-Sep-02 15:35 
I'm very amused.


- Goran.

GeneralNice :-) Pin
Nish Nishant6-Sep-02 7:33
sitebuilderNish Nishant6-Sep-02 7:33 

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